Differences

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--- electrical:solar:series_vs_parallel [2020/11/29 19:47]
frater_secessus [Series]
+++ electrical:solar:series_vs_parallel [2021/06/06 15:01]
frater_secessus [Series-Parallel]
@@ Line 42: / Line 42: @@
 ===== Series-Parallel =====
-FIXME
+Consider this scenario:
+  * 4 panels
+    * 150w
+    * Vmp == 19v
+    * Voc == 22.8
+    * Imp == 7.9A
+  * MPPT controller with 60v maximum input voltage
+A fully-series configuration ([[electrical:12v:parallel_serial|1p4s]]) would have a **Voc of 91.2v**, greatly exceeding the controller's input spec of 60v, and it's common to want to have 20% voltage headroom above Voc.
+A fully-parallel configuration (4p1s) would require 3x 2-into-1 MC4 adapters or 1x 4-into-1 adapter.  The wiring from the array would need to carry 30A+ to the controller,  necessitating heavier wiring that would cost more and might not even fit the controller terminals.  It might be unable to charge at all under extreme low-light conditions.
+A compromise might be series-parallel array (2p2s) with 45.6Voc and ~16A.  This would require 1x 2-into-1 MC4 adapter to combine the two serial strings.

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